Folders in the FMT

I have created a folder in the FMT before by selecting say 5 cut features, RMB and say add to folder.  My question is this, if I add more feature cuts later, how do I add them to that same folder?  When I try to drag and drop, I get the parent/child error.  However I dont think there is a parent child issue. What is the proper protocol for doing this?  All opinions welcome!!!

SolidworksGeneral